If you are playing in multiple worlds (MUDs) you can monitor their activity in a couple of ways.

Activity Toolbar

Click on the View menu -> Activity Toolbar to show the activity "buttons" if they are not already visible. You can drag them around, either docking them to the top, bottom or sides of the window, or leave them free as a floating window.

The buttons represent the first 10 worlds open, and change colour depending if the world is open, closed, or has new activity. You can click on any of the buttons to activate its related world window.

Activity List

This is a larger window that will show all open worlds (even if there are more than 10). It can be resized, moved, and the column order changed, to customise it to your requirements.